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Hande M, Maity S, Lönnberg T. Palladacyclic Conjugate Group Promotes Hybridization of Short Oligonucleotides. Int J Mol Sci 2018; 19:ijms19061588. [PMID: 29843368 PMCID: PMC6032164 DOI: 10.3390/ijms19061588] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 05/25/2018] [Accepted: 05/26/2018] [Indexed: 11/16/2022] Open
Abstract
Short oligonucleotides with cyclopalladated benzylamine moieties at their 5'-termini have been prepared to test the possibility of conferring palladacyclic anticancer agents sequence-selectivity by conjugation with a guiding oligonucleotide. Hybridization of these oligonucleotides with natural counterparts was studied by UV and CD (circular dichroism) melting experiments in the absence and presence of a competing ligand (2-mercaptoethanol). Cyclopalladated benzylamine proved to be strongly stabilizing relative to unmetalated benzylamine and modestly stabilizing relative to an extra A•T base pair. The stabilization was largely abolished in the presence of 2-mercaptoethanol, suggesting direct coordination of Pd(II) to a nucleobase of the complementary strand. In all cases, fidelity of Watson-Crick base pairing between the two strands was retained. Hybridization of the cyclopalladated oligonucleotides was characterized by relatively large negative enthalpy and entropy, consistent with stabilizing Pd(II) coordination partially offset by the entropic penalty of imposing conformational constraints on the flexible diethylene glycol linker between the oligonucleotide and the palladacyclic moiety.
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Affiliation(s)
- Madhuri Hande
- Department of Chemistry, University of Turku, Vatselankatu 2, 20014 Turku, Finland.
| | - Sajal Maity
- Department of Chemistry, University of Turku, Vatselankatu 2, 20014 Turku, Finland.
| | - Tuomas Lönnberg
- Department of Chemistry, University of Turku, Vatselankatu 2, 20014 Turku, Finland.
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Hogg KF, Trowbridge A, Alvarez-Pérez A, Gaunt MJ. The α-tertiary amine motif drives remarkable selectivity for Pd-catalyzed carbonylation of β-methylene C-H bonds. Chem Sci 2017; 8:8198-8203. [PMID: 29568467 PMCID: PMC5855970 DOI: 10.1039/c7sc03876c] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 10/08/2017] [Indexed: 12/27/2022] Open
Abstract
The selective C-H carbonylation of methylene bonds in the presence of traditionally more reactive methyl C-H and C(sp2)-H bonds in α-tertiary amines is reported. The exceptional selectivity is driven by the bulky α-tertiary amine motif, which we hypothesise orientates the activating C-H bond proximal to Pd in order to avoid an unfavourable steric clash with a second α-tertiary amine on the Pd centre, promoting preferential cyclopalladation at the methylene position. The reaction tolerates a range of structurally interesting and synthetically versatile functional groups, delivering the corresponding β-lactam products in good to excellent yields.
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Affiliation(s)
- Kirsten F Hogg
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , UK .
| | - Aaron Trowbridge
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , UK .
| | - Andrea Alvarez-Pérez
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , UK .
| | - Matthew J Gaunt
- Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , UK .
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[Benzylamine-K2-C,N]1,2-Bis (Diphenylphosphino)-Propane-k2-P,P] Palladium}Perchlorate, Mononuclear Complex of Ortho-Palladated Derived from Benzylamine. IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY, TRANSACTIONS A: SCIENCE 2017. [DOI: 10.1007/s40995-017-0210-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Karami K, Kharat MH, Rizzoli C, Lipkowski J. Synthesis and structural studies of cyclopalladated complexes of secondary benzylamines. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2012.12.032] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Oliva-Madrid MJ, Garcı́a-López JA, Saura-Llamas I, Bautista D, Vicente J. Ortho Palladation of the Phenethylamines of Biological Relevance l-Tyrosine Methyl Ester and Homoveratrylamine. Reactivity of the Palladacycles toward CO and Isocyanides. Synthesis of the Natural Alkaloid Corydaldine. Organometallics 2012. [DOI: 10.1021/om300141b] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- María-José Oliva-Madrid
- Grupo de Química Organometálica, Departamento de Química
Inorgánica, Facultad de Química, and ‡SAI, Universidad de Murcia, Apartado 4021, E-30071 Murcia,
Spain
| | - José-Antonio Garcı́a-López
- Grupo de Química Organometálica, Departamento de Química
Inorgánica, Facultad de Química, and ‡SAI, Universidad de Murcia, Apartado 4021, E-30071 Murcia,
Spain
| | - Isabel Saura-Llamas
- Grupo de Química Organometálica, Departamento de Química
Inorgánica, Facultad de Química, and ‡SAI, Universidad de Murcia, Apartado 4021, E-30071 Murcia,
Spain
| | - Delia Bautista
- Grupo de Química Organometálica, Departamento de Química
Inorgánica, Facultad de Química, and ‡SAI, Universidad de Murcia, Apartado 4021, E-30071 Murcia,
Spain
| | - José Vicente
- Grupo de Química Organometálica, Departamento de Química
Inorgánica, Facultad de Química, and ‡SAI, Universidad de Murcia, Apartado 4021, E-30071 Murcia,
Spain
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Synthesis and reactivity of new methylallylpalladium(II) complexes with bidentate 2-(methylthio-N-benzylidene)anilines. J Organomet Chem 2004. [DOI: 10.1016/j.jorganchem.2003.10.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Kekia OM, Watkins CL, Krannich LK, Rheingold AL, Liable-Sands LM. Synthesis and Molecular Structural Studies of a Series of Orthometalated Dimers [RAlN(t-Bu)-μ-(CH2C6H4)]2, where R = Me, Et, n-Pr, n-Bu, i-Bu. Organometallics 2001. [DOI: 10.1021/om0009379] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Vicente J, Saura-Llamas I, Turpín J, Ramírez de Arellano MC, Jones PG. Palladium-Assisted Formation of Carbon−Carbon Bonds. 8.1 Synthesis and Reactivity toward Internal Alkynes, Carbon Monoxide, and Isocyanides of Orthopalladated Dibenzylamine Complexes. Organometallics 1999. [DOI: 10.1021/om990143y] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- José Vicente
- Grupo de Química Organometálica, Departamento de Química Inorgánica, Facultad de Química, Universidad de Murcia, Apartado 4021, Murcia, 30071 Spain
| | - Isabel Saura-Llamas
- Grupo de Química Organometálica, Departamento de Química Inorgánica, Facultad de Química, Universidad de Murcia, Apartado 4021, Murcia, 30071 Spain
| | - Juana Turpín
- Grupo de Química Organometálica, Departamento de Química Inorgánica, Facultad de Química, Universidad de Murcia, Apartado 4021, Murcia, 30071 Spain
| | - M. Carmen Ramírez de Arellano
- Grupo de Química Organometálica, Departamento de Química Inorgánica, Facultad de Química, Universidad de Murcia, Apartado 4021, Murcia, 30071 Spain
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Postfach 3329, 38023 Braunschweig, Germany
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